mandela turned 90. live in oak labd, stephanie chuang, nbc bay area news. >> thank you. >>> willie brown, former mayor of san francisco met mandela at the rally in oakland and his meeting with mandela is a treasured memory. brown says this photo of the meeting is one of his favorites. >> mr. mandela inspired me as i suspect he has inspired many people to do what you think is the right thing to do. maybe not political, because i don't think nelson mandela was ever really political. >> and before being mayor of san francisco, brown spent 30 years in the assembly and was speaker in 1986. that is when california became the largest government in the united states to devest from south african investments because of apartheid. the state pension and university fund sold more than $11 billion worth of securities as a result. >>> none of this was easy. mandela's activism took him from life in prison to leader of his nation. in 1944, he was 26 years old when he co-founded african national congress. after a 1960 ma